Amazon Fraud Detector is no longer be open to new customers as of November 7, 2025. For capabilities similar to Amazon Fraud Detector, explore Amazon SageMaker AI, AutoGluon, and AWS WAF.

# Common Parameters


The following list contains the parameters that all actions use for signing Signature Version 4 requests with a query string. Any action-specific parameters are listed in the topic for that action. For more information about Signature Version 4, see [Signing AWS API requests](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_aws-signing.html) in the *IAM User Guide*.

 **X-Amz-Algorithm**   <a name="CommonParameters-X-Amz-Algorithm"></a>
The hash algorithm that you used to create the request signature.  
Condition: Specify this parameter when you include authentication information in a query string instead of in the HTTP authorization header.  
Type: string  
Valid Values: `AWS4-HMAC-SHA256`   
Required: Conditional

 **X-Amz-Credential**   <a name="CommonParameters-X-Amz-Credential"></a>
The credential scope value, which is a string that includes your access key, the date, the region you are targeting, the service you are requesting, and a termination string ("aws4\$1request"). The value is expressed in the following format: *access\$1key*/*YYYYMMDD*/*region*/*service*/aws4\$1request.  
For more information, see [Create a signed AWS API request](https://docs.aws.amazon.com/IAM/latest/UserGuide/create-signed-request.html) in the *IAM User Guide*.  
Condition: Specify this parameter when you include authentication information in a query string instead of in the HTTP authorization header.  
Type: string  
Required: Conditional

 **X-Amz-Date**   <a name="CommonParameters-X-Amz-Date"></a>
The date that is used to create the signature. The format must be ISO 8601 basic format (YYYYMMDD'T'HHMMSS'Z'). For example, the following date time is a valid X-Amz-Date value: `20120325T120000Z`.  
Condition: X-Amz-Date is optional for all requests; it can be used to override the date used for signing requests. If the Date header is specified in the ISO 8601 basic format, X-Amz-Date is not required. When X-Amz-Date is used, it always overrides the value of the Date header. For more information, see [Elements of an AWS API request signature](https://docs.aws.amazon.com/IAM/latest/UserGuide/signing-elements.html) in the *IAM User Guide*.  
Type: string  
Required: Conditional

 **X-Amz-Security-Token**   <a name="CommonParameters-X-Amz-Security-Token"></a>
The temporary security token that was obtained through a call to AWS Security Token Service (AWS STS). For a list of services that support temporary security credentials from AWS STS, see [AWS services that work with IAM](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_aws-services-that-work-with-iam.html) in the *IAM User Guide*.  
Condition: If you're using temporary security credentials from AWS STS, you must include the security token.  
Type: string  
Required: Conditional

 **X-Amz-Signature**   <a name="CommonParameters-X-Amz-Signature"></a>
Specifies the hex-encoded signature that was calculated from the string to sign and the derived signing key.  
Condition: Specify this parameter when you include authentication information in a query string instead of in the HTTP authorization header.  
Type: string  
Required: Conditional

 **X-Amz-SignedHeaders**   <a name="CommonParameters-X-Amz-SignedHeaders"></a>
Specifies all the HTTP headers that were included as part of the canonical request. For more information about specifying signed headers, see [Create a signed AWS API request](https://docs.aws.amazon.com/IAM/latest/UserGuide/create-signed-request.html) in the *IAM User Guide*.  
Condition: Specify this parameter when you include authentication information in a query string instead of in the HTTP authorization header.  
Type: string  
Required: Conditional